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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55477bd46eb72769975058ab1d162c39d340834a552f145849ed55f8f4c52fff' 
  AND token = 'sMLmTxQPE3XNVdytyCtDe5E4/2KjatnRnyYvcV4Z07o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}